path: root/src/classes/com/sun/opengl/impl/windows/WindowsGLDrawable.java

/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

package com.sun.opengl.impl.windows;

import java.awt.Component;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;

import javax.media.opengl.*;
import com.sun.opengl.impl.*;

public abstract class WindowsGLDrawable extends GLDrawableImpl {
  protected static final boolean DEBUG = Debug.debug("WindowsGLDrawable");

  protected long hdc;
  protected Component component;
  protected GLCapabilities capabilities;
  protected GLCapabilitiesChooser chooser;
  protected boolean pixelFormatChosen;

  protected static final int MAX_PFORMATS = 256;
  protected static final int MAX_ATTRIBS  = 256;

  public WindowsGLDrawable(Component component,
                           GLCapabilities capabilities,
                           GLCapabilitiesChooser chooser) {
    this.component = component;
    this.capabilities = (GLCapabilities) capabilities.clone();
    this.chooser = chooser;
  }

  public void setRealized(boolean val) {
    throw new GLException("Should not call this (should only be called for onscreen GLDrawables)");
  }

  public void destroy() {
    throw new GLException("Should not call this (should only be called for offscreen GLDrawables)");
  }

  public void swapBuffers() throws GLException {
  }

  public long getHDC() {
    return hdc;
  }

  public void choosePixelFormat(boolean onscreen) {
    PIXELFORMATDESCRIPTOR pfd = null;
    int pixelFormat = 0;
    if (onscreen) {
      if (WGL.GetPixelFormat(hdc) != 0) {
        // The Java2D/OpenGL pipeline probably already set a pixel
        // format for this canvas.
        if (DEBUG) {
          System.err.println("NOTE: pixel format already chosen (by Java2D/OpenGL pipeline?) for window: " + 
                             WGL.GetPixelFormat(hdc));
        }
        pixelFormatChosen = true;
        return;
      }

      GLCapabilities[] availableCaps = null;
      int numFormats = 0;
      pfd = newPixelFormatDescriptor();
      GraphicsConfiguration config = component.getGraphicsConfiguration();
      GraphicsDevice device = config.getDevice();
      // Produce a recommended pixel format selection for the GLCapabilitiesChooser.
      // Use wglChoosePixelFormatARB if user requested multisampling and if we have it available
      WindowsGLDrawable dummyDrawable = null;
      GLContextImpl     dummyContext  = null;
      WGLExt            dummyWGLExt   = null;
      if (capabilities.getSampleBuffers()) {
        dummyDrawable = new WindowsDummyGLDrawable();
        dummyContext  = (GLContextImpl) dummyDrawable.createContext(null);
        if (dummyContext != null) {
          dummyContext.makeCurrent();
          dummyWGLExt = (WGLExt) dummyContext.getPlatformGLExtensions();
        }
      }      
      int recommendedPixelFormat = -1;
      boolean haveWGLChoosePixelFormatARB = false;
      boolean haveWGLARBMultisample = false;
      boolean gotAvailableCaps = false;
      if (dummyWGLExt != null) {
        haveWGLChoosePixelFormatARB = dummyWGLExt.isExtensionAvailable("WGL_ARB_pixel_format");
        haveWGLARBMultisample       = dummyWGLExt.isExtensionAvailable("WGL_ARB_multisample");

        try {
          if (haveWGLChoosePixelFormatARB) {
            int[]   iattributes = new int  [2 * MAX_ATTRIBS];
            int[]   iresults    = new int  [2 * MAX_ATTRIBS];
            float[] fattributes = new float[2 * MAX_ATTRIBS];
            int niattribs = 0;
            int nfattribs = 0;
            iattributes[niattribs++] = WGLExt.WGL_SUPPORT_OPENGL_ARB;
            iattributes[niattribs++] = GL.GL_TRUE;
            iattributes[niattribs++] = WGLExt.WGL_DRAW_TO_WINDOW_ARB;
            iattributes[niattribs++] = GL.GL_TRUE;
            iattributes[niattribs++] = WGLExt.WGL_PIXEL_TYPE_ARB;
            iattributes[niattribs++] = WGLExt.WGL_TYPE_RGBA_ARB;
            iattributes[niattribs++] = WGLExt.WGL_DOUBLE_BUFFER_ARB;
            if (capabilities.getDoubleBuffered()) {
              iattributes[niattribs++] = GL.GL_TRUE;
            } else {
              iattributes[niattribs++] = GL.GL_FALSE;
            }
            iattributes[niattribs++] = WGLExt.WGL_STEREO_ARB;
            if (capabilities.getStereo()) {
              iattributes[niattribs++] = GL.GL_TRUE;
            } else {
              iattributes[niattribs++] = GL.GL_FALSE;
            }
            iattributes[niattribs++] = WGLExt.WGL_DEPTH_BITS_ARB;
            iattributes[niattribs++] = capabilities.getDepthBits();
            iattributes[niattribs++] = WGLExt.WGL_RED_BITS_ARB;
            iattributes[niattribs++] = capabilities.getRedBits();
            iattributes[niattribs++] = WGLExt.WGL_GREEN_BITS_ARB;
            iattributes[niattribs++] = capabilities.getGreenBits();
            iattributes[niattribs++] = WGLExt.WGL_BLUE_BITS_ARB;
            iattributes[niattribs++] = capabilities.getBlueBits();
            iattributes[niattribs++] = WGLExt.WGL_ALPHA_BITS_ARB;
            iattributes[niattribs++] = capabilities.getAlphaBits();
            iattributes[niattribs++] = WGLExt.WGL_STENCIL_BITS_ARB;
            iattributes[niattribs++] = capabilities.getStencilBits();
            if (capabilities.getAccumRedBits()   > 0 ||
                capabilities.getAccumGreenBits() > 0 ||
                capabilities.getAccumBlueBits()  > 0 ||
                capabilities.getAccumAlphaBits()  > 0) {
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_BITS_ARB;
              iattributes[niattribs++] = (capabilities.getAccumRedBits() +
                                          capabilities.getAccumGreenBits() +
                                          capabilities.getAccumBlueBits() +
                                          capabilities.getAccumAlphaBits());
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_RED_BITS_ARB;
              iattributes[niattribs++] = capabilities.getAccumRedBits();
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_GREEN_BITS_ARB;
              iattributes[niattribs++] = capabilities.getAccumGreenBits();
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_BLUE_BITS_ARB;
              iattributes[niattribs++] = capabilities.getAccumBlueBits();
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_ALPHA_BITS_ARB;
              iattributes[niattribs++] = capabilities.getAccumAlphaBits();
            }
            if (haveWGLARBMultisample) {
              if (capabilities.getSampleBuffers()) {
                iattributes[niattribs++] = WGLExt.WGL_SAMPLE_BUFFERS_ARB;
                iattributes[niattribs++] = GL.GL_TRUE;
                iattributes[niattribs++] = WGLExt.WGL_SAMPLES_ARB;
                iattributes[niattribs++] = capabilities.getNumSamples();
              }
            }
          
            int[] pformats = new int[MAX_PFORMATS];
            int[] numFormatsTmp = new int[1];
            if (dummyWGLExt.wglChoosePixelFormatARB(hdc,
                                                    iattributes, 0,
                                                    fattributes, 0,
                                                    MAX_PFORMATS,
                                                    pformats, 0,
                                                    numFormatsTmp, 0)) {
              numFormats = numFormatsTmp[0];
              if (numFormats > 0) {
                // Remove one-basing of pixel format (added on later)
                recommendedPixelFormat = pformats[0] - 1;
                if (DEBUG) {
                  System.err.println(getThreadName() + ": Used wglChoosePixelFormatARB to recommend pixel format " + recommendedPixelFormat);
                }
              }
            } else {
              if (DEBUG) {
                System.err.println(getThreadName() + ": wglChoosePixelFormatARB failed: " + WGL.GetLastError() );
                Thread.dumpStack();
              }
            }
            if (DEBUG) {
              if (recommendedPixelFormat < 0) {
                System.err.print(getThreadName() + ": wglChoosePixelFormatARB didn't recommend a pixel format");
                if (capabilities.getSampleBuffers()) {
                  System.err.print(" for multisampled GLCapabilities");
                }
                System.err.println();
              }
            }

            // Produce a list of GLCapabilities to give to the
            // GLCapabilitiesChooser.
            // Use wglGetPixelFormatAttribivARB instead of
            // DescribePixelFormat to get higher-precision information
            // about the pixel format (should make the GLCapabilities
            // more precise as well...i.e., remove the
            // "HardwareAccelerated" bit, which is basically
            // meaningless, and put in whether it can render to a
            // window, to a pbuffer, or to a pixmap)
            niattribs = 0;
            iattributes[0] = WGLExt.WGL_NUMBER_PIXEL_FORMATS_ARB;
            if (dummyWGLExt.wglGetPixelFormatAttribivARB(hdc, 0, 0, 1, iattributes, 0, iresults, 0)) {
              numFormats = iresults[0];
              // Should we be filtering out the pixel formats which aren't
              // applicable, as we are doing here?
              // We don't have enough information in the GLCapabilities to
              // represent those that aren't...
              iattributes[niattribs++] = WGLExt.WGL_DRAW_TO_WINDOW_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ACCELERATION_ARB;
              iattributes[niattribs++] = WGLExt.WGL_SUPPORT_OPENGL_ARB;
              iattributes[niattribs++] = WGLExt.WGL_DEPTH_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_STENCIL_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_DOUBLE_BUFFER_ARB;
              iattributes[niattribs++] = WGLExt.WGL_STEREO_ARB;
              iattributes[niattribs++] = WGLExt.WGL_PIXEL_TYPE_ARB;
              iattributes[niattribs++] = WGLExt.WGL_RED_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_GREEN_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_BLUE_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ALPHA_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_RED_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_GREEN_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_BLUE_BITS_ARB;
              iattributes[niattribs++] = WGLExt.WGL_ACCUM_ALPHA_BITS_ARB;
              if (haveWGLARBMultisample) {
                iattributes[niattribs++] = WGLExt.WGL_SAMPLE_BUFFERS_ARB;
                iattributes[niattribs++] = WGLExt.WGL_SAMPLES_ARB;
              }

              availableCaps = new GLCapabilities[numFormats];
              for (int i = 0; i < numFormats; i++) {
                if (!dummyWGLExt.wglGetPixelFormatAttribivARB(hdc, i+1, 0, niattribs, iattributes, 0, iresults, 0)) {
                  throw new GLException("Error getting pixel format attributes for pixel format " + (i + 1) + " of device context");
                }
                availableCaps[i] = iattributes2GLCapabilities(iattributes, iresults, niattribs, true);
              }
              gotAvailableCaps = true;
            } else {
              int lastErr = WGL.GetLastError();
              // Intel Extreme graphics fails with a zero error code
              if (lastErr != 0) {
                throw new GLException("Unable to enumerate pixel formats of window using wglGetPixelFormatAttribivARB: error code " + WGL.GetLastError());
              }
            }
          }
        } finally {
          dummyContext.release();
          dummyContext.destroy();
          dummyDrawable.destroy();
        }
      }

      // Fallback path for older cards, in particular Intel Extreme motherboard graphics
      if (!gotAvailableCaps) {
        if (DEBUG) {
          if (!capabilities.getSampleBuffers()) {
            System.err.println(getThreadName() + ": Using ChoosePixelFormat because multisampling not requested");
          } else {
            System.err.println(getThreadName() + ": Using ChoosePixelFormat because no wglChoosePixelFormatARB");
          }
        }
        pfd = glCapabilities2PFD(capabilities, onscreen);
        // Remove one-basing of pixel format (added on later)
        recommendedPixelFormat = WGL.ChoosePixelFormat(hdc, pfd) - 1;

        numFormats = WGL.DescribePixelFormat(hdc, 1, 0, null);
        if (numFormats == 0) {
          throw new GLException("Unable to enumerate pixel formats of window for GLCapabilitiesChooser");
        }
        availableCaps = new GLCapabilities[numFormats];
        for (int i = 0; i < numFormats; i++) {
          if (WGL.DescribePixelFormat(hdc, 1 + i, pfd.size(), pfd) == 0) {
            throw new GLException("Error describing pixel format " + (1 + i) + " of device context");
          }
          availableCaps[i] = pfd2GLCapabilities(pfd);
        }
      }

      // Supply information to chooser
      pixelFormat = chooser.chooseCapabilities(capabilities, availableCaps, recommendedPixelFormat);
      if ((pixelFormat < 0) || (pixelFormat >= numFormats)) {
        throw new GLException("Invalid result " + pixelFormat +
                              " from GLCapabilitiesChooser (should be between 0 and " +
                              (numFormats - 1) + ")");
      }
      if (DEBUG) {
        System.err.println(getThreadName() + ": Chosen pixel format (" + pixelFormat + "):");
        System.err.println(availableCaps[pixelFormat]);
      }
      pixelFormat += 1; // one-base the index
      if (WGL.DescribePixelFormat(hdc, pixelFormat, pfd.size(), pfd) == 0) {
        throw new GLException("Error re-describing the chosen pixel format: " + WGL.GetLastError());
      }
    } else {
      // For now, use ChoosePixelFormat for offscreen surfaces until
      // we figure out how to properly choose an offscreen-
      // compatible pixel format
      pfd = glCapabilities2PFD(capabilities, onscreen);
      pixelFormat = WGL.ChoosePixelFormat(hdc, pfd);
    }
    if (!WGL.SetPixelFormat(hdc, pixelFormat, pfd)) {
      int lastError = WGL.GetLastError();
      if (DEBUG) {
        System.err.println(getThreadName() + ": SetPixelFormat failed: current context = " + WGL.wglGetCurrentContext() +
                           ", current DC = " + WGL.wglGetCurrentDC());
        System.err.println(getThreadName() + ": GetPixelFormat(hdc " + toHexString(hdc) + ") returns " + WGL.GetPixelFormat(hdc));
      }
      throw new GLException("Unable to set pixel format " + pixelFormat + " for device context " + toHexString(hdc) + ": error code " + lastError);
    }
    pixelFormatChosen = true;
  }

  static PIXELFORMATDESCRIPTOR glCapabilities2PFD(GLCapabilities caps, boolean onscreen) {
    int colorDepth = (caps.getRedBits() +
                      caps.getGreenBits() +
                      caps.getBlueBits());
    if (colorDepth < 15) {
      throw new GLException("Bit depths < 15 (i.e., non-true-color) not supported");
    }
    PIXELFORMATDESCRIPTOR pfd = newPixelFormatDescriptor();
    int pfdFlags = (WGL.PFD_SUPPORT_OPENGL |
                    WGL.PFD_GENERIC_ACCELERATED);
    if (caps.getDoubleBuffered()) {
      pfdFlags |= WGL.PFD_DOUBLEBUFFER;
    }
    if (onscreen) {
      pfdFlags |= WGL.PFD_DRAW_TO_WINDOW;
    } else {
      pfdFlags |= WGL.PFD_DRAW_TO_BITMAP;
    }
    pfd.dwFlags(pfdFlags);
    pfd.iPixelType((byte) WGL.PFD_TYPE_RGBA);
    pfd.cColorBits((byte) colorDepth);
    pfd.cRedBits  ((byte) caps.getRedBits());
    pfd.cGreenBits((byte) caps.getGreenBits());
    pfd.cBlueBits ((byte) caps.getBlueBits());
    pfd.cAlphaBits((byte) caps.getAlphaBits());
    int accumDepth = (caps.getAccumRedBits() +
                      caps.getAccumGreenBits() +
                      caps.getAccumBlueBits());
    pfd.cAccumBits     ((byte) accumDepth);
    pfd.cAccumRedBits  ((byte) caps.getAccumRedBits());
    pfd.cAccumGreenBits((byte) caps.getAccumGreenBits());
    pfd.cAccumBlueBits ((byte) caps.getAccumBlueBits());
    pfd.cAccumAlphaBits((byte) caps.getAccumAlphaBits());
    pfd.cDepthBits((byte) caps.getDepthBits());
    pfd.cStencilBits((byte) caps.getStencilBits());
    pfd.iLayerType((byte) WGL.PFD_MAIN_PLANE);
    return pfd;
  }

  static PIXELFORMATDESCRIPTOR newPixelFormatDescriptor() {
    PIXELFORMATDESCRIPTOR pfd = PIXELFORMATDESCRIPTOR.create();
    pfd.nSize((short) pfd.size());
    pfd.nVersion((short) 1);
    return pfd;
  }

  static GLCapabilities pfd2GLCapabilities(PIXELFORMATDESCRIPTOR pfd) {
    if ((pfd.dwFlags() & WGL.PFD_SUPPORT_OPENGL) == 0) {
      return null;
    }
    GLCapabilities res = new GLCapabilities();
    res.setRedBits       (pfd.cRedBits());
    res.setGreenBits     (pfd.cGreenBits());
    res.setBlueBits      (pfd.cBlueBits());
    res.setAlphaBits     (pfd.cAlphaBits());
    res.setAccumRedBits  (pfd.cAccumRedBits());
    res.setAccumGreenBits(pfd.cAccumGreenBits());
    res.setAccumBlueBits (pfd.cAccumBlueBits());
    res.setAccumAlphaBits(pfd.cAccumAlphaBits());
    res.setDepthBits     (pfd.cDepthBits());
    res.setStencilBits   (pfd.cStencilBits());
    res.setDoubleBuffered((pfd.dwFlags() & WGL.PFD_DOUBLEBUFFER) != 0);
    res.setStereo        ((pfd.dwFlags() & WGL.PFD_STEREO) != 0);
    res.setHardwareAccelerated(((pfd.dwFlags() & WGL.PFD_GENERIC_FORMAT) == 0) ||
			       ((pfd.dwFlags() & WGL.PFD_GENERIC_ACCELERATED) != 0));
    return res;
  }

  static GLCapabilities iattributes2GLCapabilities(int[] iattribs,
                                                   int[] iresults,
                                                   int   niattribs,
                                                   boolean requireRenderToWindow) {
    GLCapabilities res = new GLCapabilities();
    for (int i = 0; i < niattribs; i++) {
      switch (iattribs[i]) {
        case WGLExt.WGL_DRAW_TO_WINDOW_ARB:
          if (iresults[i] != GL.GL_TRUE)
            return null;
          break;

        case WGLExt.WGL_ACCELERATION_ARB:
          res.setHardwareAccelerated(iresults[i] == WGLExt.WGL_FULL_ACCELERATION_ARB);
          break;

        case WGLExt.WGL_SUPPORT_OPENGL_ARB:
          if (iresults[i] != GL.GL_TRUE)
            return null;
          break;

        case WGLExt.WGL_DEPTH_BITS_ARB:
          res.setDepthBits(iresults[i]);
          break;

        case WGLExt.WGL_STENCIL_BITS_ARB:
          res.setStencilBits(iresults[i]);
          break;

        case WGLExt.WGL_DOUBLE_BUFFER_ARB:
          res.setDoubleBuffered(iresults[i] == GL.GL_TRUE);
          break;

        case WGLExt.WGL_STEREO_ARB:
          res.setStereo(iresults[i] == GL.GL_TRUE);
          break;

        case WGLExt.WGL_PIXEL_TYPE_ARB:
          if (iresults[i] != WGLExt.WGL_TYPE_RGBA_ARB)
            return null;
          break;

        case WGLExt.WGL_RED_BITS_ARB:
          res.setRedBits(iresults[i]);
          break;
          
        case WGLExt.WGL_GREEN_BITS_ARB:
          res.setGreenBits(iresults[i]);
          break;

        case WGLExt.WGL_BLUE_BITS_ARB:
          res.setBlueBits(iresults[i]);
          break;

        case WGLExt.WGL_ALPHA_BITS_ARB:
          res.setAlphaBits(iresults[i]);
          break;

        case WGLExt.WGL_ACCUM_RED_BITS_ARB:
          res.setAccumRedBits(iresults[i]);
          break;

        case WGLExt.WGL_ACCUM_GREEN_BITS_ARB:
          res.setAccumGreenBits(iresults[i]);
          break;

        case WGLExt.WGL_ACCUM_BLUE_BITS_ARB:
          res.setAccumBlueBits(iresults[i]);
          break;

        case WGLExt.WGL_ACCUM_ALPHA_BITS_ARB:
          res.setAccumAlphaBits(iresults[i]);
          break;

        case WGLExt.WGL_SAMPLE_BUFFERS_ARB:
          res.setSampleBuffers(iresults[i] == GL.GL_TRUE);
          break;

        case WGLExt.WGL_SAMPLES_ARB:
          res.setNumSamples(iresults[i]);
          break;

        default:
          throw new GLException("Unknown pixel format attribute " + iattribs[i]);
      }
    }
    return res;
  }

  protected static String getThreadName() {
    return Thread.currentThread().getName();
  }
}